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Here's a pleasant surprise. You can now "buy" Palm's hottest smartphone, the Centro, for free through Amazon.com.

That is after rebates and with a new service agreement. You must also keep your account in good standing for six months.

The offer applies to both the AT&T and Sprint versions of the small Palm OS handset. For more on Amazon's AT&T Centro offer, see here, and its Sprint Centro offer, see here.

At only 4.2 x 2.1 x 0.7 inches and 4.2 ounces, Centro is Palm's smallest and lightest smartphone ever. With Centro Palm is targeting the mainstream and the young for the first time with one of its smartphones; or, to put it another way, 95 percent - the vast majority - of mobile phone users.

Additional features include dial-up-networking via Bluetooth, so you can use Centro as a modem to access the Web or corporate network. You can also use Bluetooth to connect to various peripherals, including hands-free kits, wireless headsets, and GPS devices.

The smartphone's 2.2-inch touch screen supports a 320 x 320 pixel resolution and 65,000 colors. That screen is powered by a 1150mAh removable battery Palm promises will supply up to 3.5 hours talk and 3 days standby time.

Centro sports 64MB of internal storage and a microSD slot for up to 4GB additional memory in a single expansion card.

Take pictures and video with Centro's 1.3 megapixel with 2x digital zoom digital camera.